pilots at the controls of that plane. Investigators digging into their backgrounds. ABC's Brian Ross joins us from Washington with the latest on that end of the story. Good morning, Brian. Reporter: Good morning. U.s. Authorities are told the home of the two pilots have now been searched by police looking for any clues there would suggest foul play. Officials this morning say they are mystified by reports the plane continued to fly for an hour after its tracking transponder was turned off. It's a small rotary knob in the center console of the 777 cockpit easily turned on or off. It would certainly appear that either the flight crew or there's someone else in the cockpit that is making some decisions that don't really compute. Hi, everyone. Reporter: The captain, 53-year-old zaharie Ahmad shah was a pilot's pilot. This is a youtube video I made as a community service. Reporter: Seen here on his own youtube channel at the controls of a flight simulator. A 33-year veteran of the airline with more than 18,000 hours of flying but his co-pilot, 27-year-old fariq Abdul Hamid is much less experienced and they're investigating troubling reports he was kind of an airborne playboy violating safety standards in the cockpit. According to Ang Australian news report these two women say they were invited by the co-pilot to ride with him on a flight in 2011 to Kuala Lumpur. At one stage there were pretty much turned around and talking to us and so engaged in conversation he tock my friend's hand and looking at her palm and said it's very dreesed, that means you're a creative person and commented on her nail poll iron. Reporter: As is the case in so many other aviation disasters the recordings inside the cook pate may be the only way to answer whether it was a bomb or hijacking or pilot error that led to the disappearance. They are confident the answer will be found someday. But not until the plane and its black box from the cockpit are finally located.

This transcript has been automatically generated and may not be 100% accurate.

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